基于CSRRs和SRRs的复合结构左手微带线的研究

Study of Left-handed Microwave Strip Line Based on Complementary Split Ring and Split Ring Resonators

利用周期排列在中央传输导线两侧的SRRs(split-ring resonators)和在中央传输导线正下方接地板上周期蚀刻CSRRs(complementary split-ring resonators),设计一种新颖的左手传输线。该结构的特点是每个单元包含两个SRR和一个CSRR。同时,中央传输导线上蚀刻一系列带隙,并通过若干金属通孔与接地板相连。这样,CSRR与串联带隙的组合以及SRR与金属通孔的组合可以分别产生左手通带。根据设计制备出双通带微带线,其仿真和测量结果得到很好的符合。

This paper proposes a left-handed microstrip line based on split-ring resonators（SRRs） periodically placed adjacent to the central conductor strip of microstrip line and complementary split-ring resonators（CSRRs） periodically etched on the ground plane underneath the central conductor strip.Specifically,the unit cell of the proposed approach includes one CSRR cell and two SRR cells.Meanwhile,series gaps are etched in the central conductor strip which connectes to the ground plane by some via holes.By this means CSRRs with series capacitive gaps and SRRs with shunt connected via inductances can provide passband,respectively.A prototype dual-passband filter basic cell is fabricated and the measurements aggres well with simulations.